1  /* Provide a more complete sys/file.h.
       2  
       3     Copyright (C) 2007-2023 Free Software Foundation, Inc.
       4  
       5     This file is free software: you can redistribute it and/or modify
       6     it under the terms of the GNU Lesser General Public License as
       7     published by the Free Software Foundation; either version 2.1 of the
       8     License, or (at your option) any later version.
       9  
      10     This file is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      13     GNU Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public License
      16     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
      17  
      18  /* Written by Richard W.M. Jones.  */
      19  
      20  #ifndef _@GUARD_PREFIX@_SYS_FILE_H
      21  
      22  #if __GNUC__ >= 3
      23  @PRAGMA_SYSTEM_HEADER@
      24  #endif
      25  @PRAGMA_COLUMNS@
      26  
      27  /* The include_next requires a split double-inclusion guard.  */
      28  #if @HAVE_SYS_FILE_H@
      29  # @INCLUDE_NEXT@ @NEXT_SYS_FILE_H@
      30  #endif
      31  
      32  #ifndef _@GUARD_PREFIX@_SYS_FILE_H
      33  #define _@GUARD_PREFIX@_SYS_FILE_H
      34  
      35  /* This file uses GNULIB_POSIXCHECK, HAVE_RAW_DECL_*.  */
      36  #if !_GL_CONFIG_H_INCLUDED
      37   #error "Please include config.h first."
      38  #endif
      39  
      40  #ifndef LOCK_SH
      41  /* Operations for the 'flock' call (same as Linux kernel constants).  */
      42  # define LOCK_SH 1       /* Shared lock.  */
      43  # define LOCK_EX 2       /* Exclusive lock.  */
      44  # define LOCK_UN 8       /* Unlock.  */
      45  
      46  /* Can be OR'd into one of the above.  */
      47  # define LOCK_NB 4       /* Don't block when locking.  */
      48  #endif
      49  
      50  /* The definition of _GL_WARN_ON_USE is copied here.  */
      51  
      52  #if @GNULIB_FLOCK@
      53  /* Apply or remove advisory locks on an open file.
      54     Return 0 if successful, otherwise -1 and errno set.  */
      55  # if !@HAVE_FLOCK@
      56  extern int flock (int fd, int operation);
      57  # endif
      58  #elif defined GNULIB_POSIXCHECK
      59  # undef flock
      60  # if HAVE_RAW_DECL_FLOCK
      61  _GL_WARN_ON_USE (flock, "flock is unportable - "
      62                   "use gnulib module flock for portability");
      63  # endif
      64  #endif
      65  
      66  
      67  #endif /* _@GUARD_PREFIX@_SYS_FILE_H */
      68  #endif /* _@GUARD_PREFIX@_SYS_FILE_H */